JP2006050363A - Audio signal reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio signal reproducing apparatus for automatically setting an optimal sound field based on an absolute distance between a speaker of each of installed channels and a listening point. <P>SOLUTION: A remote controller 514A transmits an instruction signal CP for starting counting to a main body unit 50, so that counters of the both are synchronized. A test sound generated at a listening point P by a listener M is collected by a microphone provided in the remote controller 514A and speakers 31-35. Based on a timing value T<SB>0</SB>of a time point of sound collection due to the remote controller 514A and a timing value of a time point of sound collection due to the main body unit 50, an absolute distance calculation unit 5073 calculates an absolute distance between the listening point P and each of the speakers 31-35. A DSP 506 and a sound volume adjusting unit 508 correct a sound field in accordance with sound field adjustment data generated based on the absolute distance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sound field correction of an audio signal reproduction device, and more particularly to an audio signal reproduction device capable of correcting a sound field based on absolute distances between a plurality of speakers driven by the audio signal reproduction device and a listening point.

  In the creation of a sound field for a multi-channel audio system, various companies have proposed a sound field correction technique for the purpose of creating a sound field that is optimal for the actual listening environment conditions.

  In general, the sound field processed sound (such as the sound that created the sound field of a concert hall) reproduced by a speaker of each channel arranged at a predetermined position in the listening room is received at a predetermined position. Can be done.

  However, the listening position is not always a predetermined ideal position, and the speaker arrangement is not always in a predetermined ideal arrangement relationship. In many cases, both the speaker arrangement and the listening position are significantly different from the situation assumed at the time of designing the sound field processing in relation to the volume of the listening room depending on the situation.

  Therefore, in order to create a sound field more suitable for a more realistic listening environment, it is desirable to perform sound field correction based on the distance relationship between the actual speaker arrangement and the listening position at least when the sound field is created.

  In this regard, the following [Patent Document 1] is corrected by a listening position measuring means for measuring the listening position in the listening room, and a sound field data correcting means for correcting the sound field data in accordance with the measured listening position. There is disclosed a technique of a sound field control device including a signal processing device that processes an input signal according to sound field data and a speaker that reproduces an output signal of the signal processing device.

  The listening position measuring means measures the impulse response between each speaker arranged in advance and the microphone arranged at the listening position, and determines the microphone position (= from the delay time of the direct sound of the impulse response such as the rectangular pulse method. Listening position). However, the position coordinates of each speaker need to be acquired in advance.

Japanese Patent Laid-Open No. 03-97400

  For the measurement of the listening position for sound field correction based on the distance relationship between each speaker and the listening position of the system of [Patent Document 1], a microphone is separately installed at the listening position, and the position of each speaker is preliminarily stored. Because it is necessary to input as, it is configured to impose extremely troublesome preparation on the user.

  In addition, when listening to ordinary households, the listening position is not always the same, and it is expected that the listening position will change without the user's willingness. difficult. Therefore, there is a demand for a sound field control device that can easily and reliably measure the distance for correcting the sound field between each speaker and listening position of an appropriately arranged system.

  Furthermore, it is desirable that the distance between each speaker of the system and the listening position is obtained as absolute distance data, not relative distance data, as measurement data serving as a basis for sound field correction. Since the relative distance data does not know the distance from each speaker to the listening position, it cannot be said that it is necessary and sufficient as a material for fine sound field correction.

  The present invention has been made in view of the above circumstances, and the remote controller that constitutes the audio signal reproducing device is provided with necessary means for measuring the absolute distance, and the above-described problems are solved in cooperation with the main body and a plurality of speakers. An object of the present invention is to provide an audio signal reproducing apparatus that can be realized.

  In order to achieve the above object, the present invention provides the following audio signal reproducing apparatuses (a) to (c).

(A) In an audio signal reproducing apparatus including a main body (50) for supplying audio signals of a plurality of channels to speakers (31 to 35) of each channel and driving the speakers of each channel, and a remote controller (514A). The remote controller includes first timing generation means (5142) for generating timing values, and sound collection means (5147) for collecting test sounds emitted by the listener (M) at the listening point (P). , First capturing means (5148) for capturing the collected test sound as first received sound data, the first received sound data captured by the first capturing means, and the first timing. on the basis of the generated timing value by generating means, first to obtain the first time data (T ₀₎ An acquisition means (5144), an instruction signal (CP) indicating the start of timing value generation by the first timing generation means, and a transmission means (5145) for transmitting the first time data to the main body section. A second timing generation unit (5072) that receives the instruction signal and generates a timing value; and the test sound as second sound reception data collected by a speaker of each channel. Based on the second capturing means (5071) for capturing, the second received sound data captured by the second capturing means, and the timing value generated by the second timing generating means, time data second acquisition means for acquiring (T _{n) (5074),} based the on the second time data and the first time data, each speaker Absolute distance calculating means (5073) for calculating an absolute distance (Ln) from the listening point, and sound field adjusting means (506, 508) for generating sound field adjustment data and adjusting the sound field based on the absolute distance. An audio signal reproducing apparatus comprising:

(B) In an audio signal reproducing apparatus including a main body (50) for supplying audio signals of a plurality of channels to speakers (31 to 35) of each channel and driving the speakers of each channel, and a remote controller (514B). The remote controller includes first timing generation means (5142) for generating a timing value, signal generation means (5149) for outputting a generation signal for generating a test sound, and a test sound based on the generation signal. Generating means (5150) for generating the first time data (T ₀ ) based on the generated signal and the timing value generated by the first timing generating means (5144) and an instruction signal (CP) indicating the start of timing value generation by the first timing generation means And a transmission means (5145) for transmitting the first time data to the main body, wherein the main body receives the instruction signal and generates a timing value (5072). And a capturing means (5071) for capturing the test sound as received sound data collected by a speaker of each channel, the received sound data captured by the capturing means, and generated by the second timing generating means. Second acquisition means (5074) for acquiring second time data (T _n ) based on the timing value thus determined, and each of the first time data and the second time data based on the second time data. Absolute distance calculation means (5073) for calculating an absolute distance (Ln) between the speaker and the listening point (P), and sound field adjustment data based on the absolute distance Generated sound field adjusting means for adjusting the sound field (506, 508) and the audio signal reproducing apparatus characterized by comprising a.

(C) In an audio signal reproducing apparatus having a main body (50) for supplying audio signals of a plurality of channels to speakers (31 to 35) of each channel and driving the speakers of each channel, and a remote controller (514C). The remote controller includes a signal generation means (5149) for outputting a generation signal for generating a test sound, a generation means (5150) for generating a test sound based on the generation signal, and the generation signal as the signal. A transmission means (5145) for transmitting an instruction signal (CP) indicating that the generation means has been output to the main body, and the main body stores a first time data (T ₀ ). Means (5073), timing generation means (5072) for receiving the instruction signal and generating a timing value, and the test sound, Based on the capturing means (5071) that captures the received sound collected by the speakers of each channel, the received sound data captured by the capturing means, and the timing value generated by the timing generating means obtaining means for obtaining time data (T _n) and (5074), on the basis of the first time data and the second time data, the absolute distance between the speakers and the listening point (P) (Ln) Audio distance adjusting means (5073) for calculating the sound field, and sound field adjusting means (506, 508) for generating sound field adjustment data and adjusting the sound field based on the absolute distance. Signal reproduction device.

  According to the audio signal reproduction device of the present invention, since the synchronization counter signal for synchronization is transmitted and received between the main unit and the remote controller, the absolute distance between each speaker and the remote controller can be calculated. It becomes possible. As a result, the absolute distance data between the listening point of the user having the remote controller and each speaker can be obtained, and the sound field correction depending on the relationship between each speaker arrangement and the listening point can be precisely performed based on the absolute distance data. it can.

  In addition, each speaker is used as a microphone, and the remote controller is used as a microphone or a sound signal output means for measurement, so there is no need to prepare or install a special member for correcting the sound field. In addition, the absolute distance between each speaker and the listening point can be measured for sound field correction.

  Embodiments of an audio signal reproduction device according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing each embodiment of an audio signal reproducing apparatus. In FIG. 1, an audio signal reproducing apparatus is configured by the main body 50 and the remote controller 514A (or 514B or 514C), and an audio reproducing system is configured by the audio signal reproducing apparatus and the speakers 31 to 35 driven by the main body 50. is doing. The first embodiment uses a remote controller 514A described later, the second embodiment uses a remote controller 514B described later, and the third embodiment uses a remote controller 514C described later. The configuration and basic operation of the main body 50 are all common in the first to third embodiments. The speakers 31 to 35 are arranged as shown in FIG. 2 as an example.

<Normal playback mode>
First, normal audio signal reproduction in the main body 50 will be described.

  An audio input signal to be reproduced (a two-channel signal including information for five channels) is input to the main body 50. The audio input signal may be either a digital signal or an analog signal, and if it is a digital signal (for example, an optical digital signal), it is supplied to a digital interface receiver (DIR) 503 via a digital audio signal input terminal 501. The DIR 503 generates an audio signal and various clocks from the input digital signal.

  On the other hand, if the audio input signal is an analog signal, it is supplied to an analog / digital converter (A / D) 504 via an analog audio signal input terminal 502 and A / D converted. A digital audio input signal output from the DIR 503 or the A / D 504 is supplied to a digital signal processor (DSP) 506 via a switch 505. The switch 505 is switched depending on whether the audio input signal is a digital signal or an analog signal.

  The DSP 506 performs various signal processing on the supplied audio input signal, and generates audio signals for five channels. Note that the analog input signal requires an input terminal for each of the two-channel signals. In FIG. 1, the analog audio signal input terminal 502 is illustrated as one input terminal for the sake of simplicity. If the DSP 506 does not perform signal processing on the analog audio signal, the A / D 504 can be omitted.

  Each generated audio signal is supplied from the DSP 506 to the volume adjustment unit 508. The volume adjustment unit 508 adjusts the volume of each audio signal under the control of the CPU 507 based on volume adjustment by a volume adjustment button (not shown) provided in the remote controllers 514A to 514C. Each audio signal whose volume has been adjusted is amplified by the amplifying unit 509 and output from each of the speakers 31 to 35 via the output switching relay 510 and the speaker connection terminal 511. Note that the output switching relay 510 is closed in the normal reproduction mode.

  Next, the main body unit 50 and the remote controllers 514A to 514C in the sound field setting mode will be described.

<First embodiment>
FIG. 3 is a block diagram showing a configuration example of the remote controller 514A used in the first embodiment.

  When the listener M presses the sound field setting button 5140 provided in the input unit 5141 of the remote controller 514A at the listening point P, the CPU 5143 of the microcomputer instructs the counter 5142 to start counting. The counter 5142 starts counting in response to an instruction from the CPU 5143, and the count value is supplied to the CPU 5143. At the same time that the CPU 5143 instructs the counter 5142, the CPU 5143 controls the transmission unit 5145 to transmit the instruction signal CP to the main body unit 50 via the infrared light emitting diode (LED) 5146. The instruction signal CP indicates the timing at which the counter 5142 starts counting. It is also for synchronizing the main body 50 and the remote controller 514A.

  Since the count start instruction to the counter 5142 of the CPU 5143 and the transmission control of the instruction signal CP to the transmission unit 5145 are simultaneously performed, the difference between the count start times of the remote controller 514A and the main body unit 50 is very small. Therefore, the time lag of the count start time can be regarded as zero.

  As a signal transmission method between the remote controller 514A and the main body 50, an FM radio wave method can be applied in addition to the infrared method using the infrared light emitting diode LED 5146 and the pin photodiode PD517. In any case, a configuration with a small transmission / reception time lag is desired.

As described above, the remote controller 514A enters the sound field setting mode. When the sound field setting mode is entered, the microphone (MIC) 5147 waits for sound reception. An A / D 5148 provided in the CPU 5143 A / D converts the test sound A received by the MIC 5147. The time data acquisition unit 5144 acquires time data (timing value T ₀ ) from the A / D converted sound reception data. The timing value T ₀ is based on the count value of the counter 5142. The CPU 5143 stores the timing value T ₀ and transmits it to the main body unit 50 via the transmission unit 5145.

  FIG. 4 is a flowchart showing a processing procedure in the CPU 5143 of FIG.

  As described above, when the sound field setting button 5140 is pressed and the CPU 5143 instructs the counter 5142 to start counting and at the same time controls the transmission unit 5145 to transmit the instruction signal CP, the remote controller 514A enters the sound field setting mode. Become. In the sound field setting mode, the CPU 5143 confirms a timeout for a predetermined time (for example, 15 seconds) to determine whether or not to start automatic sound field setting in step S1. In subsequent step S2, CPU 5143 determines whether or not test sound A (for example, applause) at listening point P as shown in FIG.

  Whether or not the test sound A is input in step S2 is determined as follows.

  In FIG. 2, when the listener M generates a pulsed test sound A by clapping “Parn” at the listening point P, the test sound A is received by the MIC 5147. The received sound signal of the test sound A is converted into an electric signal by the counter electromotive force generated by the vibration of the MIC 5147, A / D converted by an A / D 5148 provided in the CPU 5143, and taken into the CPU 5143 as test sound input data. .

  If the test sound A is input for 15 seconds for determining the timeout, the process proceeds to step S3. If 15 seconds have passed and the test sound A is not input, the time-out is confirmed and the process proceeds to step S5.

When the test sound A is input, the time data acquisition unit 5144 acquires and stores time data (timing value T ₀ ) based on the test sound input data captured by the CPU 5143 in step S3. FIG. 5C is an example of a waveform diagram showing test sound input data captured by the CPU 5143. The timing value T ₀ represents, for example, the time when the test sound input data exceeds a predetermined threshold th, and the time is based on the count value of the counter 5142. Note that the timing value T ₀ may be set to represent the time of the peak value of the test sound input data.

In step S 4, the time data acquisition unit 5144 outputs the timing value T ₀ to the transmission unit 5145, and the transmission unit 5145 transmits the timing value T ₀ to the main body unit 50. This completes the sound field setting mode of the remote controller 514A.

  On the other hand, if the test sound A is not input, in step S5, the CPU 5143 outputs a signal notifying that the operation in the sound field setting mode is not completed, for example, an NG signal to the transmission unit 5145. The NG signal is transmitted from the transmission unit 5145 to the main body unit 50, and the sound field setting mode of the remote controller 514A ends.

  When the main unit 50 receives the NG signal, the display driver 515 controlled by the CPU 507 causes the display unit 516 to display a display such as “RETRY”, for example. To perform re-measurement (retry), the sound field setting button 5140 is pressed again to start the sound field setting mode. Although not shown in FIG. 4, it may be possible to return to the start again in order to perform re-measurement (retry). The number of re-measurements can be set arbitrarily.

  When the CPU 507 of the microcomputer of the main body 50 receives the instruction signal CP from the remote controller 514A via the pin photodiode (PD) 517, the CPU 507 instructs the counter 5072 to start counting. The counter 5072 starts counting in response to an instruction from the CPU 507. At the same time as instructing the counter 5072 to start counting, the CPU 507 switches (opens) the output switching relay 510 to open a plurality of channels (for example, front left channel Lch, front center channel Cch, front right channel Rch, left surround channel LSch, right surround). The supply of audio input signals to the speakers 31 to 35 (the left channel 31, the center speaker 33, the right speaker 32, the left surround speaker 34, and the right surround speaker 35) of the channel RSch (5 channels) is blocked. At this time, the sound field setting mode in which the speakers 31 to 35 of the respective channels operate as microphones is set.

When the sound field setting mode is entered and each of the speakers 31 to 35 receives the test sound A, the received test sound A is A / D converted by an A / D 5071 provided in the CPU 507 and is taken in as test sound input data. FIGS. 5A and 5B are examples of waveform diagrams showing input data of the test sound A captured by the CPU 507. FIG. Here, as an example, test sound input data of the test sound A received by the speaker 31 (Lch) and the speaker 32 (Rch) are shown. The time data acquisition unit 5074 acquires time data (timing value T _n ) based on the captured test sound input data and the count value of the counter 5072. Here, n = 1 to 5, n = 1 is Lch, n = 2 is Rch, n = 3 is Cch, n = 4 is LSch, and n = 5 is RSch. That is, T ₁ is an Lch timing value, and T ₂ is an Rch timing value.

The absolute distance calculator 5074 calculates the absolute distance Ln based on the timing values T ₀ and T _n . The absolute distance Ln also takes n = 1 to 5, and n corresponds to each channel as described above. Subsequently, the CPU 507 generates sound field correction data for correcting the sound field of the audio signal emitted from the speakers 31 to 35 of each channel based on the absolute distance Ln. Based on the sound field correction data, the DSP 506 and the volume adjustment unit 508 correct the audio signal of each channel.

  FIG. 6 is a flowchart showing a processing procedure of the CPU 507 in the main body 50 of FIG.

  The sound field setting program is stored in the CPU 507. In step S11, CPU 507 determines whether or not instruction signal CP transmitted from remote controller 514A has been received. When the CPU 507 receives the instruction signal CP, the speakers 31 to 35 are in a sound receiving state, and the main body unit 50 is in a sound field setting mode. In subsequent step S12, the counter 5072 starts counting.

  In step S13, a timeout is confirmed for a predetermined time (for example, 15 seconds) in order to determine whether or not to start automatic sound field setting. When the test sound A is input for 15 seconds for determining the timeout, the process proceeds to step S14 in order to start automatic sound field setting. If the test sound A is not input after 15 seconds, the time-out is confirmed and the process proceeds to step S19.

  Whether or not the test sound A is input in step S13 is determined as follows.

  In FIG. 2, when the listener M generates a pulsed test sound A by applauding “Parn” at the listening point P, the test sound A is collected by the speakers 31 to 35 of each channel. The collected sound signals collected by the speakers 31 to 35 are converted into electric signals by back electromotive force generated by the vibrations of the speakers 31 to 35, amplified by the amplification unit 512 (for example, about 70 dB), and then provided to the CPU 507. A / D converted by the A / D 5071 and taken into the CPU 507 as test sound input data. The CPU 507 sequentially takes in when the test sound input data of the test sound A input to each channel reaches a predetermined threshold th. The A / D 5071 samples the input signal every 30 μs, for example.

  In step S <b> 14, it is determined whether or not the test sound A input to the speakers 31 to 35 of all channels (Lch, Cch, Rch, LSch, RSch) has been captured by the CPU 507. Here, all channels refer to all channels to which the speakers 31 to 35 are connected. The listener M can set whether or not the speakers 31 to 35 are connected. In step S14, it is determined whether or not capturing has been completed only for the channel of the connected speaker. If the completion of capture can be confirmed, the process returns to step S15, and if not confirmed, the process returns to step S13 again.

In step S15, the time data acquisition unit 5074 acquires time data (timing values T _{1 to} T ₅ ) for the test sound input data of each channel captured by the CPU 507. The timing values T _{1 to} T ₅ represent the time at which the test sound input data of each channel exceeds a predetermined threshold th, and the time is based on the count of the counter 5072. The timing values T _{1 to} T ₅ may be set so as to represent the time of the peak value of the test sound input data. The CPU 507 stores timing values T _{1 to} T ₅ .

In step S16, the absolute distance calculation unit 5073 calculates the absolute distances L1 to L5 (shown in FIG. 2) between the speakers 31 to 35 and the listening point P from the timing values T ₀ and T _{1 to} T ₅ as follows ( 1) Calculate using the formula. Here, the propagation velocity c is a value represented by c = 331.5 + 0.61 t (m / second) (t = room temperature), but is fixed to a value of about c = 340 (m / second) for simplification. May be.

_{Ln = c (T n -T 0} ) (n = 1~5) ... (1)
Note that the distance L0 between the listening point P and the remote controller 514A of the listener M that has generated the test sound A shown in FIG. 2 may be regarded as zero. In addition, since transmission / reception of signals between the infrared or radio remote controller 514A and the main unit 50 is performed instantaneously, the time lag between the counter 5142 and the counter 5072 is negligibly small. Therefore, (T _n −T ₀ ) as time data can be regarded as the time during which the sound wave propagates the absolute distance Ln.

  In step S <b> 17, based on the calculated absolute distances L <b> 1 to L <b> 5, the CPU 507 determines the timing at which the audio signal of each channel emitted from the speakers 31 to 35 reaches the listening point P and the volume that the listener M listens to at the listening point P. To set (adjust) the delay time setting data and volume adjustment data, which are sound field correction data.

  The CPU 507 sets the delay time of the audio signal of each channel in the DSP 506 based on the delay time setting data, and the CPU 507 controls the volume adjustment unit 508 to adjust the volume of the audio signal of each channel based on the volume adjustment data. The DSP 506 sets the delay time based on the delay time setting data so that the audio signals reach the listening point P at the same time, and the volume adjusting unit 508 listens if the audio signals have the same volume based on the volume adjustment data. Adjust the volume so that you can listen at the same volume at point P.

  In this embodiment, the sound field is corrected based on the delay time setting data and the volume adjustment data. However, it is sufficiently effective to correct the sound field based on one of the data. Note that the DSP 506 and the volume control unit 508 are collectively used as a sound field control unit.

  When the sound field setting is completed, the CPU 507 switches (closes) the output switching relay 510 so that an audio input signal can be supplied to each of the speakers 31 to 35, and ends the sound field setting mode.

  On the other hand, when the time-out is confirmed in step S13, the display driver 515 controlled by the CPU 507 displays, for example, “SILENT-ALL” on the display unit 516 in step S19. Although not shown in FIG. 6, it may be possible to return to the start again in order to perform remeasurement (retry). The number of re-measurements can be set arbitrarily.

<Second embodiment>
Next, FIG. 7 is a block diagram showing a configuration example of a remote controller 514B used in the second embodiment. 7, substantially the same parts as those of the remote controller 514A of the first embodiment shown in FIG.

  When the listener M presses the sound field setting button 5140 provided in the input unit 5141 of the remote controller 514B at the listening point P, the CPU 5143 instructs the counter 5142 to start counting. The counter 5142 starts counting in response to an instruction from the CPU 5143, and the count value is supplied to the CPU 5143. At the same time that the CPU 5143 instructs the counter 5142, the CPU 5143 controls the transmission unit 5145 to transmit the instruction signal CP to the main body unit 50 via the infrared light emitting diode (LED) 5146. The instruction signal CP indicates the timing at which the counter 5142 starts counting.

Subsequently, when the listener M presses a signal generation button 5151 provided in the input unit 5141, the signal generation unit 5149 generates a distance measurement signal. The speaker 5150 generates a sound by the distance measurement signal and generates a test sound B toward the speakers 31 to 35. FIG. 9C is an example of a waveform diagram of the distance measurement signal output from the signal generation unit 5149. When the signal generation unit 5149 generates the distance measurement signal, the time data acquisition unit 5144 acquires the time data (timing value T ₀ ) at which the distance measurement signal was generated. The time is based on the count value of the counter 5142.

CPU5143 stores the timing value _{T 0,} control so as to transmit the timing value _{T 0} in the main body portion 50 via the LED5146 to the transmission unit 5145.

9A and 9B are examples of waveform diagrams showing test sound input data captured by the CPU 507 of the main body 50 in the second embodiment. Here, as an example, waveform diagrams of input data of the test sound B received by the speaker 31 (Lch) and the speaker 32 (Rch) are respectively shown. In the second embodiment, the timing values T ₁ and T ₂ are the times when the test sound input data exceeds the predetermined threshold th, but are set so as to represent the time of the peak value of the test sound input data. Also good.

  FIG. 8 is a flowchart showing the processing procedure of the CPU 5143 in FIG.

  As described above, when the sound field setting button 5140 is pressed and the CPU 5143 instructs the counter 5142 to start counting, and the CPU 5143 controls to transmit the instruction signal CP to the transmission unit 5145, the remote controller 514B sets the sound field setting. Become a mode. The counter 5142 supplies the count value to the CPU 5143.

  In step S21, when the signal generation button 5151 provided in the input unit 5141 is pressed, the signal generation unit 5149 generates a distance measurement signal. The distance measurement signal is preferably a pulse sound. The generated distance measurement signal is supplied to the speaker 5150, and the speaker 5150 generates the test sound B toward the speakers 31 to 35.

In step S22, the time data acquisition unit 5144 acquires and stores the time data (timing value T ₀ ) when the signal generation unit 5149 generates the distance measurement signal. The timing value T ₀ represents the time when the distance measurement signal is generated, and the time is based on the count of the counter 5142. Here, it is assumed that there is no time lag between the generation of the distance measurement signal and the output of the test sound B from the speaker 5150.

In subsequent step S <b> 23, the time data acquisition unit 5144 supplies the timing value T ₀ to the transmission unit 5145, and the timing value T ₀ is transmitted from the transmission unit 5145 to the main body unit 50. This completes the sound field setting mode of the remote controller 514B.

The processing procedure in the sound field setting mode of the CPU 507 and the configuration of the main body 50 after the main body 50 receives the instruction signal CP, the test sound B, and the timing value T ₀ in the second embodiment are the same as those in the first embodiment. The description is omitted because it is the same as described.

  According to the second embodiment, since the remote controller 514B can generate the distance measurement signal, it is not necessary for the listener M to generate the test sound A, and the absolute distance Ln can be accurately measured with less error.

<Third embodiment>
Next, FIG. 10 is a block diagram showing a configuration example of a remote controller 514C used in the third embodiment. 10, substantially the same parts as those of the remote controllers 514A and 514B of the first and second embodiments shown in FIGS. 3 and 7 are denoted by the same reference numerals.

  When the listener M presses the sound field setting button 5152 provided in the input unit 5141 of the remote controller 514C at the listening point P, the CPU 5143 sends the transmission unit 5145 to the main body unit 50 via the infrared light emitting diode (LED) 5146. Control to transmit the instruction signal CP. The instruction signal CP is an instruction for the counter 5072 of the main body 50 to start counting. At the same time as the CPU 5143 controls the transmission unit 5145, the CPU 5143 controls the signal generation unit 5149 to generate a distance measurement signal. The signal generation unit 5149 supplies a distance measurement signal to the speaker 5150, and the speaker 5150 outputs the test sound B toward the speakers 31 to 35.

  FIG. 11 is a flowchart showing the processing procedure of the CPU 5143 in FIG.

  As described above, the sound field setting button 5152 is pressed, and simultaneously with the transmission control of the instruction signal CP from the CPU 5143 to the transmission unit 5145, the CPU 5143 controls the signal generation unit 5149 to generate the distance measurement signal. In step S31, the signal generation unit 5149 generates a distance measurement signal. In the subsequent step S32, the generated distance measurement signal is supplied to the speaker 5150, and the speaker 5150 outputs the test sound B toward the speakers 31 to 35. This completes the sound field setting mode of the remote controller 514C.

In the third embodiment, the instruction signal CP is transmitted from the transmission unit 5145 to the main body unit 50, and the distance measurement signal generated by the signal generation unit 5149 is output from the speaker 5150 as the test sound B. Shall have no time lag. That is, the time data (timing value T ₀ ) when the test sound B is output is T ₀ = 0. Thus, in the third embodiment, it is not necessary to transmit the timing value T ₀ to the main body unit 50. Therefore, it is not necessary to provide a counter in the remote controller 514C, or it is not necessary to generate the timing value T ₀ based on the counter value by the counter 5072 as in the first and second embodiments. The absolute distance calculation unit 5073 of the main body unit 50 stores T ₀ = 0 in advance.

  The processing procedure in the sound field setting mode of the CPU 507 and the configuration of the main body 50 after the main body 50 receives the instruction signal CP and the test sound B in the third embodiment are the same as those described in the first embodiment. Therefore, explanation is omitted.

  According to the third embodiment, since the test sound B and the instruction signal CP are transmitted from the remote controller 514C at a time only by the listener M pressing the sound field setting button 5152, the sound field setting operation for the listener M is one. It's simple and easy. In addition, the absolute distance Ln can be accurately measured with less error.

  Thus, according to the audio signal reproduction device of the present invention, the absolute distance Ln between the remote controllers 514A to 514C of the listener M and the speakers 31 to 35 is calculated by a simple operation of the remote controllers 514A to 514C. . The sound field data is corrected based on the calculated absolute distance Ln, and the audio input signal is processed according to the corrected sound field data. Therefore, a sound field that is extremely accurate and optimal for the listener M can be generated. .

It is a block diagram which shows each embodiment of an audio signal reproducing | regenerating apparatus. It is a figure which shows an example of speaker arrangement | positioning. It is a block diagram which shows the structural example of the remote controller of 1st embodiment. It is a flowchart which shows the process sequence in CPU of the remote controller of 1st embodiment. It is an example of the wave form diagram of the test sound input data in 1st embodiment. It is a flowchart which shows the process sequence in CPU of a main-body part. It is a block diagram which shows the structural example of the remote controller of 2nd embodiment. It is a flowchart which shows the process sequence of CPU in the remote controller of 2nd embodiment. It is an example of the wave form diagram of the test sound input data in 2nd embodiment. It is a block diagram which shows the structural example of the remote controller of 3rd embodiment. It is a flowchart which shows the process sequence of CPU in the remote controller of 3rd embodiment.

Explanation of symbols

31-35 Speaker 50 Main body 514A-514C Remote controller 5142 Counter (first timing generation means)
5143 Central Processing Unit (CPU)
5144 Time data acquisition unit (first acquisition means)
5145 Transmission unit (transmission means)
5147 Microphone (MIC) (Sound collecting means)
5148 A / D (first capturing means)
5071 A / D (second capturing means)
5072 counter (second timing generation means)
5073 Absolute distance calculation unit (absolute distance calculation means)
5074 Time data acquisition unit (second acquisition means)
506 Digital signal processor (DSP) (sound field adjustment means)
507 Central processing unit (CPU)
508 Volume adjustment unit (sound field adjustment means)

Claims (3)

In an audio signal reproducing apparatus having a main body unit for supplying audio signals of a plurality of channels to speakers of each channel and driving the speakers of each channel, and a remote controller,
The remote controller is
First timing generating means for generating a timing value;
A sound collecting means for collecting the test sound emitted by the listener at the listening point;
First capturing means for capturing the collected test sound as first received sound data;
First acquisition means for acquiring first time data based on the first received sound data acquired by the first acquisition means and the timing value generated by the first timing generation means. When,
An instruction signal indicating the start of generation of a timing value by the first timing generation means, and a transmission means for transmitting the first time data to the main body,
The main body is
Second timing generation means for receiving the instruction signal and generating a timing value;
Second capturing means for capturing the test sound as second received sound data collected by a speaker of each channel;
Second acquisition means for acquiring second time data based on the second received sound data acquired by the second acquisition means and the timing value generated by the second timing generation means. When,
Based on the first time data and the second time data, absolute distance calculation means for calculating an absolute distance between each speaker and the listening point;
An audio signal reproduction device comprising: sound field adjustment means for generating sound field adjustment data and adjusting the sound field based on the absolute distance. In an audio signal reproducing apparatus having a main body unit for supplying audio signals of a plurality of channels to speakers of each channel and driving the speakers of each channel, and a remote controller,
The remote controller is
First timing generating means for generating a timing value;
Signal generation means for outputting a generation signal for generating a test sound;
Generating means for generating a test sound based on the generated signal;
First acquisition means for acquiring first time data based on the generation signal and the timing value generated by the first timing generation means;
An instruction signal indicating the start of generation of a timing value by the first timing generation means, and a transmission means for transmitting the first time data to the main body,
The main body is
Second timing generation means for receiving the instruction signal and generating a timing value;
Capturing means for capturing the test sound as received sound data collected by a speaker of each channel;
Second acquisition means for acquiring second time data based on the received sound data acquired by the acquisition means and the timing value generated by the second timing generation means;
Based on the first time data and the second time data, absolute distance calculating means for calculating an absolute distance between each speaker and the listening point;
An audio signal reproducing apparatus comprising: sound field adjustment means for generating sound field adjustment data and adjusting the sound field based on the absolute distance. In an audio signal reproducing apparatus having a main body unit for supplying audio signals of a plurality of channels to speakers of each channel and driving the speakers of each channel, and a remote controller,
The remote controller is
Signal generation means for outputting a generation signal for generating a test sound;
Generating means for generating a test sound based on the generated signal;
Transmission means for transmitting to the main body an instruction signal indicating that the generation signal is output to the signal generation means;
The main body is
Storage means for storing first time data;
Timing generating means for receiving the instruction signal and generating a timing value;
Capturing means for capturing the test sound as received sound data collected by a speaker of each channel;
An acquisition means for acquiring second time data based on the received sound data acquired by the acquisition means and the timing value generated by the timing generation means;
Based on the first time data and the second time data, absolute distance calculating means for calculating an absolute distance between each speaker and the listening point;
An audio signal reproducing apparatus comprising: sound field adjustment means for generating sound field adjustment data and adjusting the sound field based on the absolute distance.

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